After open inguinal hernia surgery 3 weeks ago on the left side, my left testicle doesn't raise up anymore. it was normal before, worried.

Cremaster Muscle: The vas and blood vessels to the testicle are covered by a muscle layer that has to be divided when performing an open inguinal hernia repair, called the cremaster muscle. Depending how extensive the dissection, your testicle may not raise up any more. While i can understand your concern, this should have no major effect on your testicle function. Please discuss with your surgeon.

Sometimes: Surgeon needs to cut some of cremasteric muscle to repair hernia. It has very little to do with testicular function. You should not be concerned, but ask your surgeon just to be sure.